NDLI: Counter rotating fans — An aircraft propulsion for the future?

Content Provider	Springer Nature Link
Author	Schimming, Peter
Copyright Year	2003
Abstract	In the mid seventies a new propulsor for aircraft was designed and investigated - the so-called PROPFAN. With regard to the total pressure increase, it ranges between a conventional propeller and a turbofan with very high bypass ratio. This new propulsion system promised a reduction in fuel consumption of 15 to 25% compared to engines at that time.A lot of propfans (Hamilton Standard, USA) with different numbers of blades and blade shapes have been designed and tested in wind tunnels in order to find an optimum in efficiency, Fig.1. Parallel to this development GE, USA, made a design of a counter rotating unducted propfan, the so-called UDF, Fig.2. A prototype engine was manufactured and investigated on an in-flight test bed mounted at the MD82 and the B727.Since that time there has not been any further development of propfans (except AN 70 with NK 90-engine, Ukraine, which is more or less a propeller design) due to relatively low fuel prices and technical obstacles. Only technical programs in different countries are still going on in order to prepare a data base for designing counter rotating fans in terms of aeroacoustics, aerodynamics and aeroelasticities. In DLR, Germany, a lot of experimental and numerical work has been undertaken to understand the physical behaviour of the unsteady flow in a counter rotating fan.
Starting Page	97
Ending Page	103
Page Count	7
File Format	PDF
ISSN	10032169
Journal	Journal of Thermal Science
Volume Number	12
Issue Number	2
e-ISSN	1993033X
Language	English
Publisher	Science Press
Publisher Date	2003-01-01
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	propfan counter rotation unsteady aerodynamics active noise control aeroelasticities Mechanics, Fluids, Thermodynamics Engineering Fluid Dynamics Engineering Thermodynamics, Transport Phenomena
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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